Irregular astigmatism

Khurana

1. Irregular Astigmatism Irregular change of refractive power in different meridia

2. Etiological Types Curvatural IA Extensive corneal scars Keratoconus Index IA Cataract

3. Clinical Picture Signs Defective vision Distortion of objects Polyopia Symptoms Retinoscopy : Irregular pupillary reflex Slitlamp exam : Corneal irregularity Placido’s disc test : Distorted circles Photokeratoscopy : Irregular corneal curvature

4. Treatment Optical treatment Contact lens Phototherapeutic keratectomy Excimer laser Superficial corneal scar Surgical treatment Extensive corneal scarring Penetrating keratoplasty

5. Thank you